
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "Sk1DPathEffect.h"
#include "SkCornerPathEffect.h"
#include "SkPathMeasure.h"
#include "SkRandom.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkDither.h"

// exercise scale/linear/devkern
struct Setting
    {
    SkScalar    fScale;
    bool        fLinearText;
    bool        fDevKernText;
    };

static const SkScalar ONE = SkIntToScalar(9999)/10000;

static const Setting gSettings[] =
    {
        { 0,            false,  false   },
        { 0,            false,  true    },
        { 0,            true,   false   },
        { 0,            true,   true    },
        { ONE,   false,  false   },
        { ONE,   false,  true    },
        { ONE,   true,   false   },
        { ONE,   true,   true    }
    };

static void doMeasure(SkCanvas* canvas, const SkPaint& paint, const char text[])
    {
    SkScalar    dy = paint.getFontMetrics(NULL);

    size_t      len = strlen(text);
    SkAutoTMalloc<SkScalar> autoWidths(len);
    SkScalar*   widths = autoWidths.get();
    SkAutoTMalloc<SkRect> autoRects(len);
    SkRect*     rects = autoRects.get();
    SkRect      bounds;

    SkPaint p(paint);
    for (size_t i = 0; i < SK_ARRAY_COUNT(gSettings); i++)
        {
        p.setLinearText(gSettings[i].fLinearText);
        p.setDevKernText(gSettings[i].fDevKernText);
        SkScalar scale = gSettings[i].fScale;

        int n = p.getTextWidths(text, len, widths, rects);
        SkScalar w = p.measureText(text, len, &bounds, scale);

        p.setStyle(SkPaint::kFill_Style);
        p.setColor(0x8888FF88);
        canvas->drawRect(bounds, p);
        p.setColor(0xFF000000);
        canvas->drawText(text, len, 0, 0, p);

        p.setStyle(SkPaint::kStroke_Style);
        p.setStrokeWidth(0);
        p.setColor(0xFFFF0000);
        SkScalar x = 0;
        for (int j = 0; j < n; j++)
            {
            SkRect r = rects[j];
            r.offset(x, 0);
            canvas->drawRect(r, p);
            x += widths[j];
            }

        p.setColor(0xFF0000FF);
        canvas->drawLine(0, 0, w, 0, p);
        p.setStrokeWidth(SkIntToScalar(4));
        canvas->drawPoint(x, 0, p);

        canvas->translate(0, dy);
        }
    }

class MeasureView : public SampleView
    {
    public:
        SkPaint fPaint;

        MeasureView()
            {
            fPaint.setAntiAlias(true);
            fPaint.setTextSize(SkIntToScalar(64));
            this->setBGColor(0xFFDDDDDD);
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SampleCode::TitleR(evt, "Measure");
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            canvas->translate(fPaint.getTextSize(), fPaint.getTextSize());
            doMeasure(canvas, fPaint, "Hamburgefons");
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new MeasureView;
    }
static SkViewRegister reg(MyFactory);

